The Incredible Hulk
During the bar scene in The Incredible Hulk, both Robert Downey, Jr. and William Hurt improvised the whole scene. There wasn’t a single line written in the script. So, remember that famous line Downey delivers to a drunk Ross (William Hurt), all him. Iron Man approaches Thunderbolt and says, “I hear you have an unusual problem. What if I told you we were putting a team together…”
The Hangover
Next up is the hilarious Zach Galifianakis in The Hangover. Okay, we all remember when he did some pretty wild things to that baby. Well, even Zach is a bit ashamed of this improvised moment. He said, “The one improv that will haunt me for the rest of my life, is the [ scene where I ] make the baby [unknowingly mimic a sexual act].” Luckily, it was only a doll and not a real baby in the scene. The director loved the improvisation and kept it for the film.